str="day day up"
for i in range(len(str)):
    print(str[i],end="")

# list1=[]
# # list1[0]=1
# # list1[1]=2
# list1.append(1)
# print(list1)

list3=list()
list3.append(1)
list3.append(2)
list3.append(3)
print(list3)

list2=[1,2,3]
for i in list2:
    print(i)
list2.insert(1,10)
print(list2)
list2.extend([11,12])
print(list2)
list2.sort(reverse=True)#默认升序 降序
print('============')
#print(list2.sort())
list2.sort()
print(list2)

list3=sorted(list2)
print(list2)

# list4=range(1,3)
# print(list4)

#1-10
list5=[i**2 for i in range(1,10) if i%2!=0]
print(list5)

str=('11111',)#i个字符串加,
print(type(str))

